-1.27% is the change from 628 to 620
Calculation steps:
[( 620 - 628 ) ÷ 628] x 100 = -1.27%
Formula
Percentage change = [(620 - 628) / 628] x 100
Subtract the new number by the original number
620 - 628 = -8
-8 ÷ 628 = -0.012738853503184714
-0.012738853503184714 x 100 = -1.27%